Elapsed time is the amount of time that passes between a start time and end time.
Strategy: count up in steps.
Example: From 2:15 to 3:45 → 2:15 to 3:15 = 1 hour, then 3:15 to 3:45 = 30 min. Total = 1 hr 30 min.
Mass, Volume and Time • Topic 2 of 3
Elapsed Time
Solved Examples
1
Worked Example
Start: 9:30, End: 10:45. Elapsed time?
Solution9:30 to 10:30 = 1 hour. 10:30 to 10:45 = 15 minutes. Total = 1 hr 15 min.
2
Worked Example
Start: 3:20, End: 5:05. Elapsed time?
Solution3:20 to 4:20 = 1 hour. 4:20 to 5:05 = 45 minutes. Total = 1 hr 45 min.
3
Worked Example
Start: 11:50, End: 1:25 p.m. Elapsed time?
Solution11:50 to 12:50 = 1 hour. 12:50 to 1:25 = 35 minutes. Total = 1 hr 35 min.
Key Points
- Count up in hours first, then minutes.
- Cross noon carefully: 11:30 to 1:00 = 1 hr 30 min.
- Draw a time line to visualize elapsed time.
Quick Check — 4 MCQs
Tap an option to check your answer0 / 4
Q1.Elapsed time is the amount of time that has:
Explanation: Time passed.
Q2.$1$ hour equals:
Explanation: $60$ minutes.
Q3.From $2{:}00$ to $3{:}00$ is:
Explanation: $1$ hour.
Q4.Half an hour is:
Explanation: $30$ minutes.